Limekiln



(No Model.) 2 Sheets-Sheet 1.

- M. SAYRE.

LIMEKILN. No. 375,897. Patented Jan. 3, 1888.

QLWLCBW imam Jayne,

i BY Wm ATT'YS.

(N0 Modl.) 2 Sheets-Sheet 2.

M. SAYRE.

LIMEKILN.

No. 375,897. ented Jan. 3,1888,

jlfiwaw Jayne, Zm 73W! BY ATTYS.

kiln, to improve the quality of the lime and in which like letters of referenceindicatelike UNITED STATES PATENT Orrrca.

MARCUS SAYRE, OF NEWVARK, NEW JERSEY.

LIMEKILN.

" SPECIFICATION forming part of Letters Patent Nov 375,897, dated January 3, 1888.

Serial No. 231,667. (No mode.)

To all whom it may concern.-

Be it known that I, MARCUS SAYRE, a citizen of the United States, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Limekilns; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

The object of this invention is to secure increased efficiency in the operation of a limeinerease the production of the same.

The invention consists in certain novel features in the construction of the kiln, whereby the advantages above enumerated are obtained, as will be hereinafter set forth, and I finally pointed out inthe claims.

Referring to the accompanying drawings,

parts in each of the several figures, Figure 1, Sheet 1 re resents a to or Jlan view of in Y a p l l .l

improved kiln. Fig. 2, same sheet, represents a vertical transverse section through lineX of Fig. 1, showing certain structural arrange ments of the kiln. Fig. 3, Sheet 2, represents I an elevation of my improved kiln.

In said drawings, A represents the walls of l the kiln; B, the receptacle for the limestone; O, fire-places or ovens; D, a smoke stack or fine.

My design in the present application is to cover certain improvements upon an invention described and claimed in my application filed February 21, 1887.

Among the methods which have been heretofore prevalent in burning lime it has been the custom to lay first a stratum of stone, then one of coal, then one of stone, and so on, to the top of the kiln. The difiicultyiu this is that the residue of the productions of combustion mixes with the lime and great labor is involved in separating them after the lime has been burned, and even then impurities are leftin the lime, which greatly impair its value.

Another method is to burn the lime with wood. This necessitates the use of an oven with an approximately level bottom to burn the wood in, and outlets or pigeon-holes to allow the heat to escape and mix with the limestone. The difficulty attending this method is that when the lime is drawn, having been burned, a pressure of air is occasioned by the settling of the limestone, the only escape for which is through the even where the wood is burned. Therefore, before the lime is settled the fire has to be drawn, otherwise it would bescattered by the strong pressure of air in all directions, endangering the buildings and the workmcns lives; hence the putting out and rebuilding of the fires is necessitated. Thus a great delay, expense, loss of time and heat are occasioned.

My invention completely overcomes these difficulties and objections, the heat is steady and uninterrupted, more economical and safe, and produces a perfectly pure lime.

In my former application, to which reference has been made, and in which similar objects were bad in view, the fireboxes were so constructed as to render it somewhat difficult to stir up the coke, which I use for the fuel, over the mouth of theoven. Theonly convenient way was by a poker inserted through the ash-box and through the grate beneath the fire; but I have found it advisable to stir the fire or the coke in some cases from the top as well as from the bottom, and hence have changed the construction of the fire-boxes by slanting the hearth or bottom of the oven from the mouth thereof downward to intersect with the grate, as is plainly indicated at a in Fig. 2. This construction enables me to accomplish my object without any difficulty, as will be manifest upon referring to the drawings. I have also found it advisable to utilize the receptacles for the limestone to a greater depth than formerly, and hence have constructed the walls of the pit E so that they project inwardl y at the top and form a ledge upon which the limestone settles and rests, as will be seen in Fig. 2, thus considerably increasing the 9 capacity as well as the product of the kiln, as will be evident. I also construct fireboxes below the limestone, from which the heat passes through the due or fiues F into the pit beneath the limestone and upward through the same, as clearly indicated in said Fig. 2. I also construct a flue or fines, G, leading from the lower fire-boxes to those above, so that, when desirable, I can open the same and let the hot air pass up through side flues and through openings to the receptacle for the limestone, as is plainly indicated in said Fig. 2, whereby I am enabled to secure the very best and most effective distribution ofheat in order to secure the most complete reduction of the contents of the receptacle B into lime.-

A further improvement is the construction and arrangement of a smoke-stack, D, which I have found desirable in order to secure a greater draft than I have been enabled to obtain heretofore. This smoke-stack may be built of brick or metal, as maybe desired, and carried to any required height.

The flues G, above referred to, may be provided with suitable dampers. (which I have not deemed it necessary to show,) by which to open and close the same at pleasure.

Having thus described my invention, what I claim as new, and wish to have secured by Letters Patent of the United States, is-

1. The combination, in a limckiln, withthe pit thereof, of fire-boxes or ovens, as 0,10-

cated below the ledges formed at the top of said pit, and a flue or flues, as F, connecting said fire-boxes with said pit, as and for the purpose set forth.

2. The combination, in a limekiln, of fire boxes or chambers located one above another, and a flue or flues, as G, communicating with said boxes or chambers and with the receptacle for the limestone, as and for the purposes set forth.

3. In a limekiln, a firebox or fire-boXes provided with a hearth arranged upon an incline slanting from the mouth of the oven downward to the grate, as shown and de scribed, for the purpose set forth.

4. In a limekiln, a pit, as E, the walls of which project inwardly at the top and form ledges for the support of the limestone, substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 19th day of March, 1887.

MARCUS SAYRE.

\Vitnesses:

CHARLES H. PELL, OSCAR A. Mrorrnn. 

